6.07 m Exit Ticket: Laws of Thermodynamics Which of the following is an example of the First Law of Thermodynamics? A hot beverage cooling down over time. Melting ice absorbing heat without a temperature change. All of the above

**Step 1: Recall the First Law of Thermodynamics** The First Law of Thermodynamics states that energy cannot be created or destroyed; it can only change forms. This is expressed with the formula \[ \Delta U = Q - W \] where \(\Delta U\) is the change in internal energy, \(Q\) is the heat added to the system, and \(W\) is the work done by the system. **Step 2: Evaluate the First Option – A hot beverage cooling down over time** When a hot beverage cools, it is losing heat energy to its surroundings. The energy is not disappearing; it is transferred out of the beverage. This change in energy is a direct application of the First Law, as it shows conservation of energy through the transfer of heat. **Step 3: Evaluate the Second Option – Melting ice absorbing heat without a temperature change** During the melting of ice, the system absorbs heat, but this heat is used to change the phase of the ice rather than increasing its temperature (latent heat of fusion). The energy supplied goes into overcoming the molecular bonds instead of raising the internal kinetic energy, again demonstrating energy conservation as prescribed by the First Law. **Step 4: Conclusion** Both scenarios illustrate energy transformation and conservation as stated by the First Law of Thermodynamics. Therefore, the correct answer is: All of the above.